powerpc64: improve extern struct ABI #44066
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r? @arielb1 (rust_highfive has picked a reviewer for you, use r? to override) |
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@bors: r+ Nice fixes! |
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📌 Commit fdd889d has been approved by |
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powerpc64: improve extern struct ABI These fixes all have to do with the 64-bit PowerPC ELF ABI for big-endian targets. The ELF v2 ABI for powerpc64le already worked well. - Return after marking return aggregates indirect. Fixes #42757. - Pass one-member float aggregates as direct argument values. - Aggregate arguments less than 64-bit must be written in the least- significant bits of the parameter space. - Larger aggregates are instead padded at the tail. (i.e. filling MSBs, padding the remaining LSBs.) New tests were also added for the single-float aggregate, and a 3-byte aggregate to check that it's filled into LSBs. Overall, at least these formerly-failing tests now pass on powerpc64: - run-make/extern-fn-struct-passing-abi - run-make/extern-fn-with-packed-struct - run-pass/extern-pass-TwoU16s.rs - run-pass/extern-pass-TwoU8s.rs - run-pass/struct-return.rs
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@bors: r- Apparently this found an existing bug :( |
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@bors: retry |
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@bors: retry I've seen a lot of PRs that look like they're still running in github but travis has finished? Like a webhook request to github hasn't happened or something. |
arielb1
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@bors r- See appveyor failure |
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For I'll go file that in GCC bugzilla, but what do you suggest we do here in the meantime? |
Perhaps just ignore the test on MinGW? |
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OK, I disabled |
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@bors: r+ |
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📌 Commit dd8f4eb has been approved by |
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⌛ Testing commit dd8f4ebf5a784e82da96e49cb08e7de573902618 with merge e933fcfd9b05d0d5372911e68cee3551b6d21721... |
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💔 Test failed - status-appveyor |
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Looks like another likely preexising bug? |
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For i686, Unlike the Win64 case, it's not as clear to me if this is a true ABI problem or if it's just a difference in |
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Nice investigation! I"m totally ok w/ just ignoring the test for now and waiting to see what upstream says |
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OK, I filed gcc 82041 and further masked the test. |
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@bors: r+ |
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📌 Commit ff9b6f7 has been approved by |
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⌛ Testing commit ff9b6f7a73a0e9c786b30959c92735db344efbd1 with merge dddd749ea0fe9df7076b8091cfca3fa676199535... |
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💔 Test failed - status-travis |
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I don't have macOS to test on, but using |
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@cuviper if it helps on a Mac I've got when I compile this code I get this 32-bit assembly and this 64-bit assembly |
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Thanks! Your 64-bit asm is passing and returning in XMM0, which must be fine since the test did pass on x86_64-apple-darwin (before the job was canceled). Your 32-bit asm returns the value in ST0 like I saw too, with the |
These fixes all have to do with the 64-bit PowerPC ELF ABI for big-endian targets. The ELF v2 ABI for powerpc64le already worked well. - Return after marking return aggregates indirect. Fixes rust-lang#42757. - Pass one-member float aggregates as direct argument values. - Aggregate arguments less than 64-bit must be written in the least- significant bits of the parameter space. - Larger aggregates are instead padded at the tail. (i.e. filling MSBs, padding the remaining LSBs.) New tests were also added for the single-float aggregate, and a 3-byte aggregate to check that it's filled into LSBs. Overall, at least these formerly-failing tests now pass on powerpc64: - run-make/extern-fn-struct-passing-abi - run-make/extern-fn-with-packed-struct - run-pass/extern-pass-TwoU16s.rs - run-pass/extern-pass-TwoU8s.rs - run-pass/struct-return.rs
Following Clang's lead, and anecdotal evidence from the `float_one` part of `run-make/extern-fn-struct-passing-abi`, use a floating point register to return single-float aggregates, except on MSVC targets.
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OK, I think that will fix i686. Following Clang's lead, I have |
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@bors: r+ |
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📌 Commit 40b1473 has been approved by |
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Sep 2, 2017
powerpc64: improve extern struct ABI These fixes all have to do with the 64-bit PowerPC ELF ABI for big-endian targets. The ELF v2 ABI for powerpc64le already worked well. - Return after marking return aggregates indirect. Fixes #42757. - Pass one-member float aggregates as direct argument values. - Aggregate arguments less than 64-bit must be written in the least- significant bits of the parameter space. - Larger aggregates are instead padded at the tail. (i.e. filling MSBs, padding the remaining LSBs.) New tests were also added for the single-float aggregate, and a 3-byte aggregate to check that it's filled into LSBs. Overall, at least these formerly-failing tests now pass on powerpc64: - run-make/extern-fn-struct-passing-abi - run-make/extern-fn-with-packed-struct - run-pass/extern-pass-TwoU16s.rs - run-pass/extern-pass-TwoU8s.rs - run-pass/struct-return.rs
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☀️ Test successful - status-appveyor, status-travis |
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These fixes all have to do with the 64-bit PowerPC ELF ABI for big-endian
targets. The ELF v2 ABI for powerpc64le already worked well.
significant bits of the parameter space.
(i.e. filling MSBs, padding the remaining LSBs.)
New tests were also added for the single-float aggregate, and a 3-byte
aggregate to check that it's filled into LSBs. Overall, at least these
formerly-failing tests now pass on powerpc64: